road gang vs crew

road gang and crew both are nouns.

Word	Noun	Adjective	Verb	Adverb
road gang	Yes	No	No	No
crew	Yes	No	Yes	No

As nouns, crew is a hypernym of road gang; that is, crew is a word with a broader meaning than road gang:

Other hypernyms of road gang include gang, work party.

road gang (noun)	crew (noun)
a gang of road workers	an organized group of workmen
	the men and women who man a vehicle (ship, aircraft, etc.)
	the team of men or women manning a racing shell
	an informal body of friends

road gang (verb)	crew (verb)
	serve as a crew member on